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TNF-alpha and IL-1beta-mediated regulation of MMP-9 and TIMP-1 in renal proximal tubular cells.

Abstract：

BACKGROUND:Tubulointerstitial fibrosis is a morphologic hallmark of chronic kidney disease and is a key factor in the prediction of progression to end-stage renal failure. Disruption of tubular basement membrane and interstitial extracellular matrix (ECM) via cytokine-induced alterations in matrix metalloproteinases (MMPs), and tissue inhibitors of metalloproteinases (TIMPs) may be an important mechanism in this process. The presence of the proinflammatory cytokines tumor necrosis factor-alpha (TNF-alpha) and interleukin-1beta (IL-1beta) and their effects on proximal tubular cells may be critical in this process. METHODS:Human proximal tubular cells were cultured in hormonally defined medium. Cells at 80% confluency were exposed to TNF-alpha (0.1 to 100 ng/mL) or IL-1beta (0.1 to 100 ng/mL) or a combination of both for 48 hours. Activity and expression of MMP-9 was examined by gelatin zymography and Western blot analysis. TIMP-1 expression was analyzed by Western blotting. Signaling through cytokine receptors, protein kinase C (PKC) and mitogen-activated protein kinase (MAPK) pathways was investigated. RESULTS:TNF-alpha but not IL-1beta resulted in a dose-dependent increase in the latent form of MMP-9. TIMP-1 was decreased by treatment with either TNF-alpha or IL-1beta. Cotreatment with IL-1beta abolished the induction of MMP-9 but augmented the inhibition of TIMP-1 in the presence of TNF-alpha. Inhibition of PKC provided evidence of the importance of this pathway in mediating the cytokine-induced suppression of TIMP-1 in human kidney (HK-2) cells. Activation of the extracellular signal-regulated protein kinase (ERK1/2) MAPK mediated the up-regulation of MMP-9 by TNF-alpha whereas p38 was found to be involved in the IL-1beta-mediated inhibition of TNF-alpha-stimulated MMP-9. CONCLUSION:The differential effects of TNF-alpha and IL-1beta on proximal tubular MMP-9 and TIMP-1 expression are mediated through the TNF-RI, the IL-1-RI and the different signaling pathways of PKC, ERK1/2, and p38 MAPK. These findings may provide new insights into the role of proinflammatory cytokines TNF-alpha and IL-1beta in the development and possible therapeutic intervention in tubulointerstitial fibrosis.

journal_name

Kidney Int

journal_title

Kidney international

authors

Nee LE,McMorrow T,Campbell E,Slattery C,Ryan MP

doi

10.1111/j.1523-1755.2004.00900.x

subject

Has Abstract

pub_date

2004-10-01 00:00:00

pages

1376-86

issue

4

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)50204-4

journal_volume

66

pub_type

杂志文章

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